dstf cop rev2 - government of · pdf filelucky queen and bellekeno deposits will be processed...

Suite 1150, 200 Granville StreetVancouver, BC V6C 1S4

Phone 604.633‐4888 Fax 604.688.4887www.alexcoresource.com

September5,2012

RobertHolmes,Director,MineralResourcesGovernmentofYukonDepartmentofEnergy,Mines&ResourcesP.O.Box2703Whitehorse,YukonY1A2C6

DearMr.Holmes:

Regarding:DryStackTailingsFacilityConstructionandOperationPlanRevision2,QML‐0009

Thissubmission(revision2)oftheDryStackTailingsFacility(DSTF)ConstructionandOperationPlanincorporatesthedepositionoftailingsgeneratedbymillingOnekandLuckyQueenore.OrefromtheOnek,LuckyQueenandBellekenodepositswillbeprocessedthroughtheDistrictMillgeneratingcompositetailingstobedepositedintheexistingDSTF.

AttachmentA,EBAOpiniononPropertiesofLuckyQueenandOnekTailsForUseinExistingDryStackTailingsFacility,NearBellekenoMill,YT,providesconfirmationthatthephysicalandchemicalpropertiesofthetailingsthatwillbeproducedfromthetwoneworezonesareexpectedtobeverysimilartothegeologicalandgeotechnicalpropertiesoftheBellekenoorezonetailings.AttachmentBprovidesgeochemicalcharacterizationoftheOnekandLuckyQueentailings,showingtheyaregeochemicallysimilartotheBellekenotailings.

ThepreviouslysubmittedandapprovedDetailedDesignDry‐StackedTailingsFacilityReportandtheapprovedOperations,Maintenance,andSurveillanceManualfortheDSTF,preparedforAlexcobyEBAEngineeringConsultantsLtd,outlinethedetaileddesignandoperationsoftheDSTF.

Sincerely,ALEXCOKENOHILLMININGCORP.

BradA.ThrallEVP&ChiefOperatingOfficer

Attachments:

A. EBAOpiniononPropertiesofLuckyQueenandOnekTailsForUseinExistingDryStackTailingsFacility,NearBellekenoMill,YT

B. GeochemicalCharacterizationofOnekandLuckyQueenTailings

Attachment A EBA Opinion on Properties of Lucky Queen and Onek Tails For Use in Exisiting Dry Stack Tailings Facility,

Near Bellekeno Mill, YT, EBA 2012

DSTF Review_Tt.docx

EBA Engineering Consultants Ltd. operating as EBA, A Tetra Tech CompanyCalcite Business Centre, Unit 6, 151 Industrial Road

Whitehorse, YT Y1A 2V3 CANADAp. 867.668.3068 f. 867.668.4349

March 2, 2012 ISSUED FOR USEEBA FILE: W14101178.011

Alexco Keno Hill Mining Corp.#4 – 151 Industrial RoadWhitehorse, YT Y1A 2V3 Via Email: [email protected]

Attention: Brad Thrall

Subject: EBA Opinion on Properties of Lucky Queen and Onek TailsFor Use in Existing Dry Stack Tailings Disposal Facility, near Bellekeno Mill, YT

The physical and chemical properties of the tailings that will be produced from the two new ore zones are expected to

be very similar to the geological and geotechnical properties of the Bellekeno ore zone tailings. Experience gained

from thorough geological review of deposits throughout the Keno Hill Silver District indicates there are minor

variations in ore mineralogy and deposit configuration, but all deposits discovered to date fall within a relatively

narrow and well understood geological range, all hosted within the same geological terrain, age range and subjected

to similar structural controls and ore genesis environments.

Within that range, the geotechnical properties of the tailings produced from milling these variations are expected to

be very similar. As part of ongoing DSTF operations, maintenance and surveillance protocol and procedures, these

assumptions will be confirmed through testing through the ongoing implementation of the Tailings Characterization

Plan. Results of analytical testing presented in the YESAB Project Proposal indicate the similar geological nature of

the three ore zones. All ore from each of the three deposits will be processed in the same mill, with the same mill

process flow sheet, therefore producing a nearly identical particle size distribution.

If there are any minor variations in the nature of Lucky Queen and Onek tails from the Bellekeno tails, they are not

expected to affect the geotechnical performance of the DSTF.

We trust this report meets your present requirements. If you have any questions or comments, please contact the

undersigned.

Sincerely,

EBA Engineering Consultants Ltd.

J. Richard Trimble, P.Eng., FEC

Principal Consultant, Arctic Engineering

Ph: 867-668-2071 x222 Email: [email protected]

Attachment B Geochemical Characterization of Onek and Lucky Queen Tailings, Access Consulting 2012

GEOCHEMICAL CHARACTERIZATION OF ONEK AND LUCKY QUEEN TAILINGS SEPTEMBER 2012

ONEK‐LQ_TAILS_CHARACTERIZATION_MEMO 1

Memorandum

To: BradThrall,AlexcoResourceCorp.

From: KaiWoloshyn

Date: September5,2012

Re: GeochemicalCharacterizationofOnekandLuckyQueenTailings

TAILINGS GENERATION

OrefromtheOnekandLuckyQueendepositswillbeprocessedattheexistingKenoDistrictMillSite,currentlyprocessingBellekenoore.CompositetailingsgeneratedfromBellekeno,LuckyQueenandOnekoreprocessingwillbedepositedinthepreviouslyassessedandlicencedDryStackTailingsFacility(DSTF)andcementpastebackfilledascompositeintotheBellekeno,OnekorLuckyQueenundergroundworkings.

TheBellekenotailingsstreamshavenotbeensegregated,aswascontemplatedduringtheBellekenolicencingprocess,becausehighpyritetailingshavenotbeengeneratedaswasanticipatedduringtheBellekenomineassessmentandlicencingprocess.ThetailingsmanagementapproachhasbeenfullydiscussedwiththeFirstNationofNachoNyakDunandYukonGovernmentregulatorssincemillcommissioningcommenced.Themillprocess produces two tailings streams based on the zinc extraction circuit (i.e., the zinc rougher and zinccleaner flotation circuits produce tailings of slightly different compositions). Table 1 summarizes themetallurgicaltestworkcompletedontheOnekandLuckyQueenOresamples.

TableTable2presentsthepyriteandothermineralogicalcontentsofthetailingsstreamsproducedfromtheOnekandLuckyQueenoresand themill tailings fromJuly toSeptember2011.TheLuckyQueenandOnektailingshaveverylowsulphideconcentrations(lessthan0.2%);theBellekenotailingsalsohaverelativelylowsulphidecontent(~2.6%).

Metallurgical Testing of Onek and Lucky Queen Ore

Process Research Associates Ltd. was commissioned by Alexco to undertake a precious and base metalrecovery study on samples originating from the Onek and Lucky Queen deposits during surface drillingprogramscompletedin2010. Thepurposeofthistestingwastodeterminetherecoveryofsilver(Ag),lead(Pb)andzinc(Zn)intheflotationcircuitsintheexistingmill,andtoevaluatetheenvironmentalparametersoftheresidualtailings.RepresentativesamplesfromdrillcorewereusedtoproduceacompositesampleofOnekandLuckyQueenformetallurgicaltesting.



TheresultsofthemetallurgicaltestworkindicatethatOnekandLuckyQueenoresamplesrespondwelltothecurrentmetallurgicalflowsheetoperatingatthemill.Thereisadirectrelationshipbetweenmetalrecovery,head grade and adequate basemetals galena and sphalerite (PbS and ZnS) in the feed tomaximize silverrecovery.Thereforebalancingthemill feedgradethroughtheconcurrentminingofLuckyQueen,OnekandBellekenowill assist andbe important in optimizingmetallurgicalperformance from theLuckyQueen andOnekdeposits. ThemetallurgicalresultsshowninTables1arenotfromlockedcycletestsbutdemonstratethe importance of adequate basemetal concentrations in the feed grade,most notably sufficient galena tooptimizeoverallleadandsilverrecovery.Additionaloptimizationtestworkwillberequiredforfinalreagentadditionoptimizationthroughlockedcycletestwork.

ThefoursamplesinTables1,2,3and4representcompositesofindividualsamplestakenfromallportionsofthemineralizedzoneofeachdeposit.Thewholerockanalyticalanalysisincludingiron(Fe)ofeachofthefourcompositesampleswaspresentedinTable3Table.TheinitialmetallurgicaltestingfortheLuckyQueenandOnek projectswas based on typical laboratory scale ore sample composites and yielded small volumes oftailings.Thescaleofthemetallurgicaltestingdidnotallowforcollectionofsupernatantsamples.Inadditiontherewasinsufficientvolumeoftailingsgeneratedbythetestingtoallowfortheestablishmentofhumiditycells. AdditionalmetallurgicaltestingandassociatedABAtestingofLuckyQueenandOneksampleswillbeongoing.

ThelevelanddetailofmetallurgicaltestworkcompletedforOnekandLuckyQueenissufficienttodeterminethatthecurrentmilloperationswilladequatelyprocessorefromthesedepositsaswellasdeterminethatthefinal mill tailings product is geochemically similar to Bellekeno so that it can be stored in the currentlypermittedDSTF.Additionalmetallurgicaltestingandreagentoptimizationisasecondaryrequirementformilloperations performance solely for operational requirements and not for determining the environmentalperformance and assessment of the tailings. Locked cycle tests were completed on Bellekeno samples todeterminethedesignoftheprocessflowsheetwhileopencycletestsonLuckyQueenandOnekcanbeusedtodeterminethecompatibilityof theseoreswiththecurrentmill flowsheet.Additionalmetallurgical testworkwill be completed as part of normal mill operations and planning but is not necessary for assessment ofenvironmentalperformancedetermination.

Onek and Lucky Queen Tailings Characterization

Followingmetallurgical testing ofOnek andLuckyQueen samples, themodifiedABAprotocolwas used tocalculateNPvalues.AlexcohassinceinstitutedasideriteABAcorrectionpackageforalltailingsandnearveinsamplingwheresignificantsideriteislikely.SubsequentABAtestinginmineralizedandnearveinmaterialforLuckyQueenandOnekwillalsousethesideritecorrectionmethod.

TheresultsshowninTable2areforthebulktailingsproducedfromthemetallurgicalflowsheettested.Astheresults indicate, the tailings fromOnekandLuckyQueenarewellaboveastandardneutralizationpotential(NP)ratio(3:1)andpotentialacidgenerationisnotexpected.OneoftheprimaryreasonsforthehighNPratioisthesignificantlylessacidpotentialduetolowertotalsulphurandbasemetals(i.e.PbS)inOnekandLuckyQueenascomparedtoBellekeno.

Carbonate species present in Onek and Lucky Queen tailings in approximate order of abundance includesiderite,calcite,ankeriteandpossiblydolomite/ferroandolomite.



Table 1 Metallurgical Testwork Summary of Onek and Lucky Queen Ore

Test

ID

Sample

ID Products Mass (%)

Grade Recovery

Ag (g/t) Pb (%) Zn (%) Ag (%) Pb (%) Zn (%)

F7 Onek

Head Grade 92.3 0.21 25.17

Pb Cl

concentrate 0.6 6899.4 32.23 11.35 48.4 74.0 0.3

Zn Cl

concentrate 37.3 45.9 0.04 53.29 21.7 6.2 85.3

Final Tailings 44.4 2.2 0.01 0.23 1.2 0.4 0.4

F8 Onek

Head Grade 333.8 3.59 12.03

Pb Cl

concentrate 2.8 5196.5 70.97 3.10 46.5 56.7 0.7

Zn Cl

concentrate 16.2 127.0 0.24 48.44 6.7 1.1 68.1

Final Tailings 65.0 11.0 0.08 1.76 2.3 1.5 9.9

F9 Lucky

Queen

Head Grade 2251.8 4.49 3.15

Pb Cl

concentrate 6.6 33084.2 65.86 2.97 93.3 95.1 5.7

Zn Cl

concentrate 4.3 214.7 0.16 58.79 0.4 0.2 73.6

Final Tailings 80.3 8.3 0.06 0.10 0.3 1.1 2.4

F10 Lucky

Queen

Head Grade 4527.7 10.40 4.58

Pb Cl

concentrate 12.1 34837.3 70.47 1.88 84.6 87.3 4.8

Zn Cl

concentrate 5.9 301.2 0.74 58.94 0.4 0.4 72.5

Final Tailings 67.7 20.9 0.09 0.06 0.3 0.6 0.9

Table 2 Onek and Lucky Queen Tailings ABA Summary

Item SampleID

S(T) S(SO4) Paste Acid Neutralization Potential (NP)

% % pH Potential Actual Ratio Net

1 F7 Final tailing/Onek 0.17 0.03 7.8 4.4 36.8 8.4 32.4

2 F8 Final tailing/Onek 0.15 0.05 7.8 3.1 26.0 8.3 22.9

3 F9 Final tailing/Lucky Queen 0.18 0.04 8.2 4.4 20.4 4.7 16.0

4 F10 Final tailing/Lucky Queen 0.19 0.04 7.5 4.7 17.8 3.8 13.1

DUP F7 Final tailing/Onek 0.17 0.03 7.8 4.4 37.1 8.5 32.8

Bellekeno Tailings, January to May 2011 Monthly Average 2.61 0.06 8.1 81.62 276.2 3.4 194.6



ThefinaltailingsdepositedintheDSTForundergroundascompositepastebackfillateitherBellekeno,LuckyQueen or Onek will be a combination of Onek, Lucky Queen and Bellekeno ores. Given the currentperformance of the Bellekeno tailings and the ABA testwork completed for Onek and Lucky Queen, bulktailingsstoredon theDSTFarenota concern fromanacidgeneratingpotentialperspective.TheOnekandLucky Queen tailings are shown to be geochemically similar or better to Bellekeno in Tables 2 to 4, andthereforethestorageoftheOnekandLuckyQueentailingsintheDSTFisappropriate.

MetalsanalysisofthetailingsfromtheLuckyQueenandOnekmetallurgicalprogramwascompletedandtheresults are shown in Table 3Table . Shake Flask Extraction (SFE) test results for the Lucky Queen tailingsamples F9 and F10 are presented in Table 4. The metal leaching concentrations from the Lucky QueentailingsSFEtestaresimilarorlessthanthoseobservedintheBellekenotailingsporewatersamplesandtheBellekenohumiditycell.

HumiditycellshavenotbeenestablishedforanyofthegeologicalmaterialsattheLuckyQueenorOneksites.TheOnekandLuckyQueentailingsarelowsulphide(<0.2%)(seeTable2);therefore,theyarenotanticipatedtobeacid‐generating.ThefollowingfactorsarerelevanttocharacterizingthepotentialeffectsofdepositionofLuckyQueenandOnektailings:

tailingsplacedasbackfillintotheundergroundworkingswillbecementedbackfillwhichincludesacementbinderthatwilleffectivelyreducetheleachabilityandpermeabilityofthebackfilledtailings;

duringtheoperationsphaseofthemine,theDSTFseepageiscollectedandroutedtotheMillPondforuseintheprocessingcircuit;

anydischargesfromtheMillPondalreadyrequiretreatmenttoachieveEQSunderQZ09‐092;

atclosuretheDSTFwillhaveasoilcoverinstalledtoreduceinfiltrationinadditiontoabioreactortoprovideongoinglong‐termwatertreatmentduringthepost‐closureperiod;and

humiditycellswerenotprovidedordeemednecessaryforassessmentorlicensingoftheBellekenomine but instead have been commissioned during operations. The information provided for theLuckyQueenandOnekassessmentisconsideredconsistentwiththatapproach.

AdditionalmetallurgicaltestingontheLuckyQueenandOnekoresiscurrentlybeingadvancedbyAlexcoandthetailingsgeneratedbythistestingwillbeutilizedforadditionalgeochemicaltestingprograms.

Elevated concentrations of sphalerite (ZnS) in the tailings will result in leachate containing higherconcentrationsofzinc.SampleF8fromOnekinTables1and2hadalowzincrecovery;consequently,thereconsiderable amount of zinc in the metallurgical analysis of the tailings shown in Table 3. Throughmetallurgicaloptimization,zincrecoverywill increase;consequently,zincconcentrations in the tailingsandleachatewilldecrease.Duringoperations, leachate fromtheDSTFwillbecollectedandrecycled in themillprocessing,ordiverted to themillwater treatmentplant.At closure, theDSTFwillbecovered tominimizewasterinfiltrationandleachatewillbetreatedwithapassivebioreactorsystem.



Bellekeno Tailings Characterization

CharacterizationoftheactualtailingsgeneratedfromBellekenooreshasbeenongoingandtheresultsofthehumiditycelltestscurrentlyinoperationonrepresentativetailingsfromtheBellekenodepositforthefirst47weeks of humidity cell operation are shown presented in Table 5 and Figures 1 to 3. The ABA andmetallurgicalmonthlyaveragesfromJanuarytoMay2011fortheBellekenotailingsareshowninTable2and3, respectively.Thehumidity cells forBellekenohavebeen inoperationover47weeks and results todateshowadecreasingtrendinmetalconcentrationsforarsenic,copper,leadandnickelinthecellleachateovertime.The exception to theobserved trends is zinc and cadmium. Zinchas shownan increasing trend toaconcentration of approximately 3mg/L while cadmium has a current concentration of approximately0.008mg/L. The 47 week humidity cell data is presented in Table 5Table . Alexco intends to continue tooperatethiscellthrough2012andinto2013.AtclosuretheDSTFwillbecovered.Table7presentstheXRDmineralogical analysis of the compositeBellekeno tailings samples collected in July,August and September2011.



Table 3 Onek and Lucky Queen Tailings Metallurgical Analysis

Elements Units

Sample ID Bellekeno Tailings

F7 Cut Tailings/ Onek

F8 Cut Tailings/ Onek

F9 Cut Tailings/

Lucky Queen

F10 Cut Tailings/Lucky

Queen

January to May 2011 Monthly

Average

C‐Inorg % 0.34 0.06 0.21 0.23 3.91

S(SO4) % 0.03 0.05 0.04 0.04 0.06

Ag ppm 3.2 9.6 9.6 23.2 53.08

Al % 0.36 0.36 0.99 0.49 1.12

As ppm 344 406 13 22 3526

Ba ppm 18 30 169 80 180

Bi ppm <2 <2 <2 <2 3

Ca % 0.65 0.28 0.48 0.27 1.55

Cd ppm 14.4 131.1 4.9 3.0 255

Co ppm <1 2 3 <1 14.6

Cr ppm 168 180 454 77 19

Cu ppm 384 370 281 226 270

Fe % 18.38 18.82 5.8 6.99 13.73

K % 0.07 0.09 0.37 0.18 0.33

La ppm 15 <10 <10 <10 8.66

Mg % 0.55 0.39 0.36 0.32 0.40

Mn ppm 52200 51678 21651 27757 42420

Mo ppm <1 <1 2 <1 0.81

Na % 0.02 0.02 0.03 0.02 0.074

Ni ppm 52 36 69 33 20

P ppm 115 165 141 122 178

Pb ppm 81 744 423 686 3498

Sb ppm <5 <5 9.0 <5 60

Sc ppm 3 2 2 1 4

Sr ppm 10 12 20 10 42

Ti % <0.01 <0.01 0.02 <0.01 0.04

Tl ppm 15 20 <10 11 0.424

V ppm 5 6 17 8 22

W ppm <10 177 <10 <10 1.46

Zn ppm 1937 15630 697 416 1749



Table 4 Shake Flask Extraction Results for Lucky Queen Tailings Samples

Mine/Dump Location

Units

Lucky Queen Tailings

Lucky Queen Bulk

Tails F9 Lucky Queen Bulk

Tails F10

Leachable Anions & Nutrients

Alkalinity, Total (as CaCO3) mg/L 28.2 25.1

Bromide (Br) mg/L <0.050 <0.050

Chloride (Cl) mg/L 1.51 0.89

Conductivity us/cm 434 352

Fluoride (F) mg/L 0.078 0.035

Nitrate (as N) mg/L 0.0259 0.0254

Nitrite (as N) mg/L 0.0072 0.0053

pH pH 8.1 8.0

Sulfate (SO4) mg/L 183 140

Hardness (as CaCO3) mg/L 204 158

Leachable Metals

Aluminum (Al)‐Leachable mg/L <0.0050 <0.0050

Antimony (Sb)‐Leachable mg/L 0.016 0.0116

Arsenic (As)‐Leachable mg/L <0.0010 <0.0010

Barium (Ba)‐Leachable mg/L 0.037 0.0459

Beryllium (Be)‐Leachable mg/L <0.00050 <0.00050

Bismuth (Bi)‐Leachable mg/L <0.00050 <0.00050

Boron (B)‐Leachable mg/L 0.025 0.014

Cadmium (Cd)‐Leachable mg/L 0.00164 0.00509

Calcium (Ca)‐Leachable mg/L 74.9 59.6

Chromium (Cr)‐Leachable mg/L <0.00050 <0.00050

Cobalt (Co)‐Leachable mg/L 0.0002 0.00702

Copper (Cu)‐Leachable mg/L 0.0303 0.0503

Iron (Fe)‐Leachable mg/L <0.030 <0.030

Lead (Pb)‐Leachable mg/L 0.0181 0.112

Lithium (Li)‐Leachable mg/L <0.0050 <0.0050

Magnesium (Mg)‐Leachable mg/L 3.96 2.27

Manganese (Mn)‐Leachable mg/L 0.765 1.14

Mercury (Hg)‐Leachable mg/L <0.000050 <0.000050

Molybdenum (Mo)‐Leachable mg/L 0.00318 0.00078

Nickel (Ni)‐Leachable mg/L 0.00067 0.00253

Phosphorus (P)‐Leachable mg/L <0.30 <0.30

Potassium (K)‐Leachable mg/L 3.93 1.87

Selenium (Se)‐Leachable mg/L 0.00871 0.00463

Silicon (Si)‐Leachable mg/L 1.91 1.11

Silver (Ag)‐Leachable mg/L 0.000144 0.000627

Sodium (Na)‐Leachable mg/L 6.19 4.57

Strontium (Sr)‐Leachable mg/L 0.193 0.141

Thallium (Tl)‐Leachable mg/L 0.00011 <0.00010

Tin (Sn)‐Leachable mg/L <0.00050 <0.00050

Titanium (Ti)‐Leachable mg/L <0.010 <0.010

Uranium (U)‐Leachable mg/L 0.000011 <0.000010

Vanadium (V)‐Leachable mg/L <0.0010 <0.0010

Zinc (Zn)‐Leachable mg/L 0.0189 0.0955



Table 5 Bellekeno Humidity Cell Results up to Week 47

Sample ID MILL TAILS

COMPOSITE‐JAN‐JUN2011‐0

MILL TAILS COMPOSITE‐JAN‐

JUN2011‐1


JUN2011‐2


JUN2011‐3


JUN2011‐4


JUN2011‐5


JUN2011‐6


JUN2011‐7


JUN2011‐8


JUN2011‐9


JUN2011‐10


JUN2011‐11

Date Sampled 17‐AUG‐11 24‐AUG‐11 31‐AUG‐11 07‐SEP‐11 14‐SEP‐11 21‐SEP‐11 28‐SEP‐11 05‐OCT‐11 12‐OCT‐11 19‐OCT‐11 26‐OCT‐11 02‐NOV‐11

ALS Sample ID L1045358‐1 L1049390‐1 L1051834‐1 L1054437‐1 L1057740‐1 L1060984‐1 L1064228‐1 L1067341‐1 L1070094‐1 L1073037‐1 L1076479‐1 L1079310‐1

Matrix Water Water Water Water Water Water Water Water Water Water Water Water

Sample Preparation

Total Volume In 750 500 500 500 500 500 500 500 500 500 500 500

Total Volume Out 550 460 460 450 450 475 435 485 475 450 500 460

Physical Tests

Conductivity 1950 1050 1050 822 648 553 523 415 463 435 438 428

pH 7.89 7.7 7.86 7.81 7.91 7.81 7.91 7.86 7.84 7.79 7.91 7.83

Anions and Nutrients

Acidity (as CaCO3) 5 4.8 5.8 10.9 5 3.4 5.6 7.1 7.2 6.3 10.4 5.1

Alkalinity, Total (as CaCO3) 43 45 68.3 64.5 49.6 62.7 68.4 78.3 73.7 73.9 72.1 75.6

Bromide (Br) <0.050 <0.50 <0.5 <0.50 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050

Chloride (Cl) 15.6 7.4 <5.0 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50

Fluoride (F) 0.354 0.37 0.34 0.34 0.288 0.27 0.254 0.208 0.183 0.164 0.161 0.179

Nitrate (as N) 10.1 3.36 <0.050 <0.050 0.0148 0.0065 0.0096 0.0052 <0.0050 <0.0050 0.007 0.0066

Nitrite (as N) 0.0845 0.089 0.011 <0.010 0.0064 <0.0010 0.0036 0.0046 <0.0010 0.0016 0.0012 0.0043

Sulfate (SO4) 1150 513 595 455 320 248 230 158 189 172 181 184

Dissolved Metals

Aluminum (Al)‐Dissolved <0.010 <0.010 <0.010 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 0.0219 <0.0050 <0.0050 <0.0050

Antimony (Sb)‐Dissolved 0.023 0.0241 0.0222 0.0178 0.0159 0.0166 0.0159 0.016 0.0164 0.0154 0.0155 0.0152

Arsenic (As)‐Dissolved 0.00081 0.00195 0.00248 0.0015 0.00139 0.00104 0.00079 0.00091 0.0008 0.0008 0.00083 0.00078

Barium (Ba)‐Dissolved 0.0985 0.056 0.0372 0.0359 0.0387 0.0347 0.0371 0.0381 0.0395 0.0368 0.0389 0.0371

Beryllium (Be)‐Dissolved <0.00020 <0.00020 <0.00020 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010

Bismuth (Bi)‐Dissolved <0.0010 <0.0010 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050

Boron (B)‐Dissolved 0.166 0.157 0.185 0.117 0.075 0.076 0.054 0.037 0.134 0.029 0.025 0.024

Cadmium (Cd)‐Dissolved 0.0264 0.0216 0.0339 0.0292 0.0228 0.0263 0.0249 0.0205 0.0294 0.0292 0.0333 0.0328

Calcium (Ca)‐Dissolved 439 217 240 192 150 119 121 90.3 101 94.3 100 94.2

Chromium (Cr)‐Dissolved <0.0010 <0.0010 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050

Cobalt (Co)‐Dissolved 0.00155 0.00089 0.00289 0.00318 0.00179 0.00198 0.002 0.0015 0.00223 0.002 0.00223 0.00219

Copper (Cu)‐Dissolved 0.0049 <0.0010 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050

Iron (Fe)‐Dissolved <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030

Lead (Pb)‐Dissolved 0.192 0.161 0.137 0.104 0.111 0.128 0.123 0.0971 0.0956 0.107 0.104 0.0985

Lithium (Li)‐Dissolved 0.0608 0.0495 0.0488 0.0269 0.0196 0.0162 0.0113 0.00832 0.0074 0.00656 0.00592 0.00589

Magnesium (Mg)‐Dissolved 17.3 10.6 10.3 6.94 4.64 3.7 2.89 1.89 2.05 1.71 1.67 1.46

Manganese (Mn)‐Dissolved 3.69 1.81 4.07 3.71 2.11 2.13 2.08 1.53 1.81 1.59 1.72 1.6

Mercury (Hg)‐Dissolved <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010

Molybdenum (Mo)‐Dissolved 0.00463 0.00467 0.00422 0.00327 0.00376 0.00393 0.00387 0.00361 0.00333 0.00314 0.00299 0.00319

Nickel (Ni)‐Dissolved 0.0037 0.0015 0.0042 0.00415 0.00193 0.00223 0.00209 0.00154 0.00264 0.00217 0.00238 0.00209

Phosphorus (P)‐Dissolved 0.61 <0.30 <0.30 <0.30 <0.30 <0.30 <0.30 <0.30 <0.30 <0.30 <0.30 <0.30

Potassium (K)‐Dissolved 27.1 13 8.75 4.78 3.74 2.88 2.23 1.57 1.58 1.3 1.29 1.17

Selenium (Se)‐Dissolved 0.00176 0.00109 0.00076 0.00075 0.00054 0.00044 0.00042 0.00028 0.00031 0.00029 0.00028 0.00026

Silicon (Si)‐Dissolved 2.48 2.82 4.61 3.76 4.07 4.28 4.42 4.11 3.97 3.98 4.07 4.17

Silver (Ag)‐Dissolved 0.00801 0.000588 <0.000020 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010

Sodium (Na)‐Dissolved 67.5 23.3 10.4 3.64 2.14 1.35 0.853 0.562 0.746 0.46 0.477 0.426

Strontium (Sr)‐Dissolved 1.33 0.623 0.565 0.382 0.276 0.249 0.245 0.179 0.185 0.166 0.168 0.187

Sulfur (S)‐Dissolved 459 249 198 147 111 86.1 78.8 53.1 63.5 58.5 60.9 57.7

Thallium (Tl)‐Dissolved 0.000564 0.000455 0.000381 0.000248 0.000147 0.000189 0.000218 0.000232 0.000105 0.000097 0.000099 0.000263

Tin (Sn)‐Dissolved <0.00020 <0.00020 <0.00020 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010

Titanium (Ti)‐Dissolved <0.010 <0.010 <0.010 <0.010 0.016 0.014 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

Uranium (U)‐Dissolved 0.000725 0.000413 0.000698 0.000526 0.000315 0.000276 0.000261 0.000179 0.000243 0.000193 0.000212 0.000188

Vanadium (V)‐Dissolved <0.0020 <0.0020 <0.0020 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010

Zinc (Zn)‐Dissolved 0.478 0.587 1.97 2.16 1.16 1.77 1.82 1.56 2.34 2.23 2.71 2.87



Sample ID MILL TAILS

COMPOSITE‐JAN‐JUN2011‐12


JUN2011‐13


JUN2011‐14


JUN2011‐15


JUN2011‐16


JUN2011‐17


JUN2011‐18


JUN2011‐19


JUN2011‐20


JUN2011‐21


JUN2011‐22


JUN2011‐23

Date Sampled 09‐NOV‐11 16‐NOV‐11 23‐NOV‐11 30‐NOV‐11 07‐DEC‐11 14‐DEC‐11 21‐DEC‐11 28‐DEC‐11 04‐JAN‐12 11‐JAN‐12 18‐JAN‐12 25‐JAN‐12



Sample Preparation

Total Volume In 500 500 500 500 500 500 500 500 500 500 500 500

Total Volume Out 460 480 450 475 470 450 460 410 445 425 420 490

Physical Tests

Conductivity 359 408 362 374 362 341 397 512 525 505 472 435

pH 7.85 7.91 7.87 7.95 7.90 7.8 7.9 7.95 7.88 7.84 7.8 7.9


Acidity (as CaCO3) 6.2 7.5 5.8 7.7 4.8 5.7 7.8 6.2 7.1 6.2 6.2 8.8

Alkalinity, Total (as CaCO3) 71.3 71.7 72.3 72.4 72.7 71.2 64.9 58.2 48.7 62.8 66.3 66.1

Bromide (Br) <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050

Chloride (Cl) <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50

Fluoride (F) 0.138 0.125 0.124 0.113 0.111 0.174 0.097 0.106 0.111 0.108 0.098 0.101

Nitrate (as N) 0.0064 0.0062 0.0141 0.0061 <0.0050 0.0101 0.0137 <0.0050 0.0061 0.01 0.0096 0.0076

Nitrite (as N) 0.0046 0.0052 0.0056 0.0046 0.004 0.0069 0.0054 0.0049 0.0026 0.0056 0.0045 0.0025

Sulfate (SO4) 128 159 129 138 130 119 129 194 206 193 175 148

Dissolved Metals

Aluminum (Al)‐Dissolved <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050

Antimony (Sb)‐Dissolved 0.0141 0.0146 0.0145 0.0142 0.013 0.0129 0.013 0.0124 0.0107 0.0099 0.00986 0.0103

Arsenic (As)‐Dissolved 0.00075 0.00087 0.00076 0.00084 0.00083 0.00082 0.00089 0.00092 0.00076 0.00084 0.00098 0.00145

Barium (Ba)‐Dissolved 0.0397 0.0441 0.0397 0.0417 0.0415 0.04 0.04 0.0465 0.045 0.0431 0.04 0.05

Beryllium (Be)‐Dissolved <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010

Bismuth (Bi)‐Dissolved <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050

Boron (B)‐Dissolved 0.019 0.018 0.015 0.017 0.015 0.01 0.01 0.013 0.011 0.01 0.01 <0.010

Cadmium (Cd)‐Dissolved 0.0272 0.0329 0.0318 0.0342 0.0351 0.03 0.04 0.0391 0.0465 0.0485 0.05 0.05

Calcium (Ca)‐Dissolved 79.2 94.6 79.7 80.6 80.6 79.50 76.70 102 103 104 97.40 85.30

Chromium (Cr)‐Dissolved <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050

Cobalt (Co)‐Dissolved 0.00164 0.00213 0.00183 0.00194 0.00188 0.00 0.00 0.00184 0.00188 0.00201 0.00 0.00

Copper (Cu)‐Dissolved <0.00050 0.0005 0.00062 0.00074 0.00078 0.00 0.00 <0.00050 <0.00050 0.00059 0.00 0.00

Iron (Fe)‐Dissolved <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030 <0.030

Lead (Pb)‐Dissolved 0.0893 0.0894 0.0927 0.0918 0.0886 0.09 0.08 0.0794 0.0943 0.0898 0.10 0.09

Lithium (Li)‐Dissolved 0.00417 0.00426 0.00365 0.00339 0.00291 0.00 0.00 0.00297 0.00282 0.00284 0.00 0.00

Magnesium (Mg)‐Dissolved 1.09 1.28 1.04 1.09 1 0.90 0.97 1.28 1.39 1.45 1.28 1.28

Manganese (Mn)‐Dissolved 1.18 1.5 1.22 1.47 1.27 1.15 1.15 1.13 1.2 1.23 1.30 1.36

Mercury (Hg)‐Dissolved <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010

Molybdenum (Mo)‐Dissolved 0.00295 0.00277 0.00268 0.00265 0.00259 0.00 0.00 0.00268 0.00266 0.00231 0.00 0.00

Nickel (Ni)‐Dissolved 0.00158 0.002 0.00161 0.00175 0.00163 0.00 0.00 0.00157 0.00125 0.00143 0.00 0.00

Phosphorus (P)‐Dissolved <0.30 <0.30 <0.30 <0.30 <0.30 <0.30 <0.30 <0.30 <0.30 <0.30 <0.30 <0.30

Potassium (K)‐Dissolved 0.846 0.923 0.807 0.794 0.727 0.64 0.65 0.715 0.702 0.618 0.58 0.63

Selenium (Se)‐Dissolved 0.0002 0.00022 0.00017 0.0002 0.00019 0.00 0.00 0.00022 0.0002 0.00017 0.00 0.00

Silicon (Si)‐Dissolved 3.67 3.71 3.73 3.51 3.62 3.36 3.21 3.01 2.95 2.98 2.94 3.25

Silver (Ag)‐Dissolved <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010

Sodium (Na)‐Dissolved 0.35 0.352 0.295 0.305 0.289 0.26 0.29 0.338 0.322 0.315 0.28 0.31

Strontium (Sr)‐Dissolved 0.129 0.148 0.147 0.144 0.134 0.12 0.11 0.147 0.174 0.146 0.14 0.12

Sulfur (S)‐Dissolved 43.4 54.1 44.3 46.7 43.5 40.50 44.40 65.8 70.6 65.8 59.30 50.50

Thallium (Tl)‐Dissolved 0.000076 0.000079 0.000243 0.000267 0.000222 0.00 0.00 0.000078 0.000238 0.000091 0.00 0.00

Tin (Sn)‐Dissolved <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010

Titanium (Ti)‐Dissolved <0.010 0.01 0.011 <0.010 <0.010 <0.010 <0.010 <0.010 0.011 <0.010 <0.010 <0.010

Uranium (U)‐Dissolved 0.000127 0.000184 0.000124 0.000147 0.000129 0.00 0.00 0.0002 0.000178 0.000153 0.00 0.00

Vanadium (V)‐Dissolved <0.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010




Sample ID MILL TAILS COMPOSITE‐

JAN‐JUN2011‐24


JUN2011‐29


JUN2011‐30


JUN2011‐31


JUN2011‐32


JUN2011‐33


JUN2011‐34


JUN2011‐35


JUN2011‐36


JUN2011‐37


JUN2011‐38


JUN2011‐39

Date Sampled 01‐FEB‐12 07‐MAR‐12 14‐MAR‐12 21‐MAR‐12 28‐MAR‐12 04‐APR‐12 11‐APR‐12 18‐APR‐12 25‐APR‐12 02‐MAY‐12 09‐MAY‐12 16‐MAY‐12



Sample Preparation

Total Volume In 500 500 500 500 500 500 500 500 500 500 500 500

Total Volume Out 425 460 475 500 470 425 480 455 475 475 500 455

Physical Tests

Conductivity 409 382 344 351 369 383 322 341 332 309 294 330

pH 7.97 7.91 7.85 7.9 7.9 7.93 7.79 7.92 7.9 7.9 7.85 7.88


Acidity (as CaCO3) 4.1 5.4 7.4 8.3 9 11.5 6.9 10.3 15 12.8 8 6.2

Alkalinity, Total (as CaCO3) 58.2 65.5 64.8 59.8 54.9 57.1 49 61.2 58.8 49.2 55.3 49.3

Bromide (Br) <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050

Chloride (Cl) <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50

Fluoride (F) 0.092 0.08 0.08 0.073 0.071 0.071 0.059 0.068 0.067 0.059 0.05 0.058

Nitrate (as N) 0.0104 0.0063 0.0074 0.0085 0.0095 0.0056 0.0057 <0.0050 0.0069 <0.0050 0.0194 0.0061

Nitrite (as N) 0.0052 0.0015 0.0019 0.0014 0.0017 0.0019 0.0018 0.001 0.0014 0.0012 <0.0010 <0.0010

Sulfate (SO4) 141 124 109 112 122 131 102 112 106 94.3 88.7 108

Dissolved Metals

Aluminum (Al)‐Dissolved <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050

Antimony (Sb)‐Dissolved 0.00943 0.00812 0.00817 0.00804 0.00749 0.00858

Arsenic (As)‐Dissolved 0.0011 0.00155 0.00129 0.00168 0.00145 0.00154

Barium (Ba)‐Dissolved 0.0407 0.0393 0.04 0.0388 0.04 0.0408

Beryllium (Be)‐Dissolved <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010

Bismuth (Bi)‐Dissolved <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050

Boron (B)‐Dissolved <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

Cadmium (Cd)‐Dissolved 0.0433 0.0491 0.05 0.0498 0.0538 0.0604 0.05 0.06 0.0525 0.0505

Calcium (Ca)‐Dissolved 83.5 62.1 67.00 58.2 67.90 55.3

Chromium (Cr)‐Dissolved <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050

Cobalt (Co)‐Dissolved 0.00195 0.00256 0.00 0.00277 0.00 0.00307

Copper (Cu)‐Dissolved 0.00082 0.00192 0.00 0.00225 0.00 0.00261

Iron (Fe)‐Dissolved <0.030 <0.030 <0.030 <0.030 <0.030 <0.030

Lead (Pb)‐Dissolved 0.0809 0.0779 0.08 0.0834 0.09 0.0926

Lithium (Li)‐Dissolved 0.00238 0.00172 0.00 0.00099 0.00 0.00148

Magnesium (Mg)‐Dissolved 1.07 0.862 0.99 0.939 1.12 1.02

Manganese (Mn)‐Dissolved 1.04 1.09 0.96 1.03 0.98 1.01

Mercury (Hg)‐Dissolved <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010

Molybdenum (Mo)‐Dissolved 0.00223 0.00178 0.00 0.00158 0.00 0.00162

Nickel (Ni)‐Dissolved 0.00145 0.00188 0.00 0.00204 0.00 0.00234

Phosphorus (P)‐Dissolved <0.30 <0.30 <0.30 <0.30 <0.30 <0.30

Potassium (K)‐Dissolved 0.497 0.385 0.37 0.331 0.35 0.317

Selenium (Se)‐Dissolved 0.00017 0.00014 0.00 0.00012 0.00 0.00013

Silicon (Si)‐Dissolved 2.87 2.72 2.43 2.41 2.58 2.45

Silver (Ag)‐Dissolved <0.000010 <0.000010 <0.000010 <0.000010 <0.000010 <0.000010

Sodium (Na)‐Dissolved 0.241 0.209 0.20 0.184 0.20 0.172

Strontium (Sr)‐Dissolved 0.119 0.104 0.11 0.101 0.10 0.103

Sulfur (S)‐Dissolved 50.7 36.7 39.40 34.7 36.70 29.6

Thallium (Tl)‐Dissolved 0.000058 0.000038 0.00 0.000039 0.00 0.000041

Tin (Sn)‐Dissolved <0.00010 <0.00010 <0.00010 <0.00010 <0.00010 <0.00010

Titanium (Ti)‐Dissolved <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

Uranium (U)‐Dissolved 0.000099 0.000049 0.00 0.000042 0.00 0.000037

Vanadium (V)‐Dissolved <0.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.0010




Sample ID MILL TAILS COMPOSITE‐

JAN‐JUN2011‐40


JUN2011‐41


JUN2011‐42


JUN2011‐43


JUN2011‐44


JUN2011‐45


JUN2011‐46


JUN2011‐47

Date Sampled 23‐MAY‐12 30‐MAY‐12 06‐JUN‐12 13‐JUN‐12 20‐JUN‐12 27‐JUN‐12 04‐JUL‐12 11‐JUL‐12

ALS Sample ID L1150106‐1 L1153466‐1 L1156963‐1 L1160871‐1 L1164482‐1 L1167961‐1 L1171477‐1 L1174741‐1

Matrix Water Water Water Water Water Water Water Water

Sample Preparation

Total Volume In 500 500 500 500 500 500 500 500

Total Volume Out 485 495 490 475 475 475 470 475

Physical Tests

Conductivity 299 299 292 281 277 274 271 270

pH 7.80 7.9 7.8 7.91 7.9 7.93 7.9 7.9


Acidity (as CaCO3) 8.8 14.9 14.3 8.7 7.7 12.9 5.3 6.8

Alkalinity, Total (as CaCO3) 57.9 55.5 62.8 58.8 48.5 47.4 49.1 56.2

Bromide (Br) <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050

Chloride (Cl) <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50

Fluoride (F) 0.052 0.05 0.048 0.044 0.041 0.037 0.038 0.04

Nitrate (as N) 0.0054 0.0067 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 0.015

Nitrite (as N) <0.0010 <0.0010 0.0019 0.0018 <0.0010 0.0013 0.0019 0.0012

Sulfate (SO4) 92.9 90.9 87.4 81.8 82.7 82.3 79.9 78

Dissolved Metals

Aluminum (Al)‐Dissolved <0.0050 <0.0050 <0.0050 <0.0050 FIELD

Antimony (Sb)‐Dissolved 0.0077 0.008 0.00729 0.00719

Arsenic (As)‐Dissolved 0.0016 0.00168 0.00137 0.00141

Barium (Ba)‐Dissolved 0.0446 0.05 0.0468 0.05

Beryllium (Be)‐Dissolved <0.00010 <0.00010 <0.00010 <0.00010

Bismuth (Bi)‐Dissolved <0.00050 <0.00050 <0.00050 <0.00050

Boron (B)‐Dissolved <0.010 <0.010 <0.010 <0.010

Cadmium (Cd)‐Dissolved 0.0596 0.06 0.06 0.0614 0.0481 0.0493 0.05 0.06

Calcium (Ca)‐Dissolved 53.9 56.60 52.8 51.20

Chromium (Cr)‐Dissolved <0.00050 <0.00050 <0.00050 <0.00050

Cobalt (Co)‐Dissolved 0.0035 0.00 0.0036 0.00

Copper (Cu)‐Dissolved 0.00241 0.00 0.00261 0.00

Iron (Fe)‐Dissolved <0.030 <0.030 <0.030 <0.030

Lead (Pb)‐Dissolved 0.0831 0.09 0.0875 0.09

Lithium (Li)‐Dissolved 0.00207 0.00 0.00165 0.00

Magnesium (Mg)‐Dissolved 1.32 1.43 1.46 1.54

Manganese (Mn)‐Dissolved 1.14 1.20 1.06 1.20

Mercury (Hg)‐Dissolved <0.000010 <0.000010 <0.000010 <0.000010

Molybdenum (Mo)‐Dissolved 0.00139 0.00 0.00138 0.00

Nickel (Ni)‐Dissolved 0.00278 0.00 0.00282 0.00

Phosphorus (P)‐Dissolved <0.30 <0.30 <0.30 <0.30

Potassium (K)‐Dissolved 0.329 0.32 0.311 0.31

Selenium (Se)‐Dissolved 0.00015 0.00 0.00015 0.00

Silicon (Si)‐Dissolved 2.57 2.62 2.48 2.49

Silver (Ag)‐Dissolved <0.000010 <0.000010 <0.000010 <0.000010

Sodium (Na)‐Dissolved 0.183 0.18 0.159 0.16

Strontium (Sr)‐Dissolved 0.0966 0.09 0.0919 0.09

Sulfur (S)‐Dissolved 31.1 29.30 27.4 27.00

Thallium (Tl)‐Dissolved 0.000039 0.00 0.000037 0.00

Tin (Sn)‐Dissolved <0.00010 <0.00010 <0.00010 <0.00010

Titanium (Ti)‐Dissolved <0.010 <0.010 <0.010 <0.010

Uranium (U)‐Dissolved 0.000035 0.00 0.00003 0.00

Vanadium (V)‐Dissolved <0.0010 <0.0010 <0.0010 <0.0010

Zinc (Zn)‐Dissolved 3.86 3.65 3.61 4.07 2.63 2.89 2.96 3.96



Figure 1 Bellekeno Tailings Humidity Cell Dissolved Zinc and Lead

Figure 2 Bellekeno Tailings Humidity Cell Dissolved As, Cd, Cu and Ni

0

0.05

0.1

0.15

0.2

0.25

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

0 5 10 15 20 25 30 35 40 45 50

Lead

, dissolved (mg/L)

Zinc, dissolved (mg/L)

Leach Cycle (Weeks)

Zinc, dissolved Lead, dissolved

0

0.001

0.002

0.003

0.004

0.005

0.006

1E‐06

1E‐05

0.0001

0.001

0.01

0.1

1

0 5 10 15 20 25 30 35 40 45 50

Arsenic, Copper, Nickel (mg/L)

Cad

mium (mg/L)

Leach Cycle (Weeks)Cadmium, dissolved Arsenic, dissolved Copper, dissolved Nickel, dissolved



Figure 3 Bellekeno Tailings Humidity Cell Alkalinity, Acidity, pH and Sulphate

Laboratory test results were used previously to assess and predict the pore water quality of the filteredtailings from Bellekeno. This filter press filtrate quality was used to predict environmental effects fromstorageoftailingsintheDryStackTailingsFacility.Table6comparestheactualfilterpressfiltrateoftailingsfrom Bellekeno against the prediction of filter press filtrate quality obtained from laboratory testing onBellekeno. The comparison demonstrates that the actual filter press filtrate is significantly better thanpredictedfromthetestwork.

Table 6 Bellekeno Tailings Filter Press Filtrate Data

Elements Units Bellekeno Filter press

filtrate From Testwork

Actual Tailings Filter press filtrate Chemistry (Average 2011)

Actual Tailings Filter press

filtrate Chemistry

(Average 2012)

Sb mg/L <0.1 0.0516 0.0498

As mg/L <0.2 0.00647 0.00375

Cd mg/L 0.12 0.00425 0.00465

Ca mg/L 145 772 768

Cr mg/L <0.01 0.00025 0.0019

Cu mg/L 0.64 0.403 0.281

Fe mg/L 4.77 0.212 0.133

Pb mg/L 0.45 0.0990 0.133

Ag mg/L <0.02 0.0236 0.0446

Zn mg/L 20.31 0.0280 0.0627

7.00

7.10

7.20

7.30

7.40

7.50

7.60

7.70

7.80

7.90

8.00

0.0

200.0

400.0

600.0

800.0

1000.0

1200.0

0 5 10 15 20 25 30 35 40 45 50

pH

as CaCO3mg/L

Leach Cycle

Acidity… Alkalinity, Total… Sulphate (SO4) pH



Ofmostsignificanceisthesignificantlylowerzincconcentrationinthefilterpressfiltrateascomparedtothetestwork. The estimate of 20 mg/L zinc was used as the basis for potential environmental effects ongroundwater from the DSTF and the comparison demonstrates that the initial estimate was highlyconservativeandactualwaterquality is significantly improved. In addition, a geosynthetic clay liner (GCL)layerwasaddedtotheDSTFdesignandhasbeeninstalledbelowtheDSTFfootprintasarequirementunderMMER to capture and measure any seepage from the tailings. The liner feature below the DSTF was notconsidered during the original assessment of the Bellekenomine or a condition of theQML, but rather anoutcomeduringthewaterlicensingphase.ThecombinationofthesubstantiallyhighABAratio(3.8to8.4:1)due to the lower sulphur content of the Onek and LuckyQueen ores, preliminary results of the Bellekenohumiditycelltests,similarityoftheOnekandLuckyQueengeochemicalcharacteristics,considerationoftheactual performance of the Bellekeno tailings and porewater chemistry compared to previously assessedtestwork,andtheadditionofaGCLlayertotheDSTFdesigngiveconsiderableconfidenceandjustificationfordepositingfilteredtailingsfromOnekandLuckyQueenintothecurrentlyauthorizedDSTF.

Alexconotesthatduringoperations,anyDSTFseepageiscollectedandroutedtotheMillPondforuseintheprocessingcircuit.AnydischargesfromtheMillPondrequiretreatmenttoachieveEffluentQualityStandardsunderQZ09‐092.Therehasbeennomilldischargetodatesincethemillwascommissionedinlate2010.AtclosuretheDSTFwillhaveasoilcoverinstalledtoreduceinfiltration, inadditiontoabioreactortoprovideongoinglong‐termwatertreatmentduringthepost‐closureperiod.



Table 7 Results of XRD‐Rietveld Mineralogical Analysis (weight %) of Bellekeno Composite Tailings

Minerals

Zn Rougher Tailings

Zn Cleaner Tailings

Final Mill Tailings

Minerals

Zn Rougher Tailings

Zn Cleaner Tailings

Final Mill Tailings

Minerals

Zn Rougher Tailings

Zn Cleaner Tailings

Final Mill Tailings

Final Mill Tailings

July 2011 Composite

July 2011 Composite

July 2011 Composite

August 2011

Composite

August 2011

Composite

August 2011

Composite

September 2011

Composite

September 2011

Composite

September 2011

Composite

February 2012

Composite

Quartz 53.44 47.07 51.27 Quartz 53.36 45.38 54.29 Quartz 51.14 46.86 48.75 47.2

Siderite 32.16 26.08 34.31 Siderite 30.37 22.27 31.33 Siderite 31.66 25.05 32.79 35.1

Muscovite 5.53 10.76 4.62 Muscovite 6.33 12.92 5.68 Muscovite 6.39 10.69 6.19 7.3

Calcite 2.23 5.17 2.92 Calcite 2.77 4.88 2.70 Calcite 3.27 4.42 2.68 2.8

Sphalerite 1.75 5.17 3.27 Sphalerite 0.94 3.40 1.83 Sphalerite 1.52 2.81 2.76 2.8

Pyrite 1.96 1.91 2.35 Pyrite 2.10 2.24 2.21 Pyrite 2.56 1.65 2.77 3.1

Galena 0.18 1.31 0.38 Galena 0.11 1.04 0.27 Galena 0.15 0.71 0.51 0.6

Plagioclase 2.36 0 0.00 Plagioclase 2.29 2.05 0 Plagioclase 2.54 2.72 0.00 0

Ankerite 0 1.02 0.66 Ankerite 1.73 0 0.58 Ankerite 0 0.52 0.99 1.1

Gahnite 0 0 0.23 Gypsum 0 1.20 0 Gypsum 0 1.22 0 0

Chalcopyrite 0.27 0 0 Rutile 0 0.67 0 Arsenopyrite 0 0 0.33 0

Clinochlore 0 0.86 0 Clinochlore 0 1.79 0 Clinochlore 0.78 1.26 0.97 0

Rutile 0 0.65 0 Clinozoisite 0 2.17 0 Clinozoisite 0 2.11 0.00 0

Wurtzite 0.12 0 0 K‐feldspar 0 0 1.13 K‐feldspar 0 0 1.26 0

Total 100.0 100.0 100.0 Total 100.0 100.0 100.0 Total 100.0 100.0 100.0 100.0

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